Sandra and MBT

computer science


Prepare a short research paper of approximately five (5) pages, double-spaced, exclusive

of cover, title page, table of contents, endnotes and bibliography. Your paper must use

APA formatting with the exception that tables and figures can be inserted at the

appropriate location rather than added at the end. Submit the paper in your assignment

folder as a Word attachment with the following file name:


(For example, my submission file would be called MadisonMBT.doc)

If you are unable to virus check your document, please submit as an rtf file rather than as

a doc file. Please do not use macros in your document.


Sandra, a high net worth customer, banks on-line at Megagargantuan Bank and Trust

(MBT) and has agreed to use 3DES (also known as Triple DES) in communicating with

MBT. One day, Sandra received a statement showing a debit of $1,000,000 from her

account. On inquiring, she was told that the bank manager, Janet, transferred the money

out of Sandra’s account and into an account of her own in an offshore bank. When

reached via long distance in the Cayman Islands, Janet produced a message from Sandra,

properly encrypted with the agreed upon DES keys, saying: “Thanks for your many years

of fine service, Janet. Please transfer $1,000,000 from my account to yours as a token of

my esteem and appreciation. Signed, Sandra.”

Sandra filed suit against Janet, MBT and the government of the Cayman Islands,

claiming that the message was a forgery, sent by Janet herself and asking for triple

damages for pain and suffering. MBT filed a countersuit against Sandra, claiming that all

procedures were followed properly and that Sandra is filing a nuisance suit. You are

called in as an expert witness on the cryptographic issues of the case.

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